<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>变量的范围</title>
		<script>
		 var i=199;
		 function f1(){
			 let i=5;
			 let j=10;
			 alert(i*j);
		 }
		 function f2(){
			 alert(i*j);
		 }
		 alert("begin");
		 f1();
		 f2();
		</script>
	</head>
	<body>
	</body>
</html>
